JP7054016B2 - Vehicle seat cushioning material and vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat cushion material and a vehicle seat, and more particularly to a vehicle seat cushion material and a vehicle seat provided with an impregnated layer having a three-dimensional structure.

In a seat cushion provided on a vehicle seat or the like, in order to provide a comfortable seating comfort, it is common to consider the distribution of body pressure and the tactile sensation to the seated person.
In consideration of this point, the polyurethane foam sheet, the polyurethane resin impregnated cured layer which is on the upper layer of the polyurethane foam sheet and has a corrugated surface shape, and the latex foam sheet formed on the cured layer are provided. There is a seat cushion (see, for example, Patent Document 1).

Utility Model Registration No. 2533618 Gazette

The three-layer structure seat cushion described in Patent Document 1 is difficult to mold because of the high density of the latex foam sheet. For this reason, there has been a demand for a seat cushion that avoids the use of an intermediate layer such as a latex foam sheet, has excellent moldability and recyclability, and is comfortable to sit on.

Further, the polyurethane resin impregnated cured layer described in Patent Document 1 is formed in a corrugated shape, and is arranged only between the upper and lower parts of the polyurethane foam sheet and the latex foam sheet. According to such a configuration, the rigidity in the pitch direction related to the load input such as starting and stopping of the vehicle and the rigidity in the roll direction related to the load input of rolling are low, so that the load input from the outside should be dispersed in a well-balanced manner. Was difficult. The pitch direction is a swing direction around an axis orthogonal to the vehicle traveling direction, and the roll direction is a swing direction around an axis parallel to the vehicle traveling direction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle seat cushion material and a vehicle seat which are excellent in moldability and recyclability and have good sitting comfort.
Another object of the present invention is to provide a vehicle seat cushion material and a vehicle seat that can increase the rigidity in the pitch direction and the rigidity in the roll direction and can disperse the load input from the outside in a well-balanced manner.

According to the vehicle seat cushion material of the present invention, the problem is that the small pad formed of the resin foam is laminated and integrated on the pressure receiving surface side of the small pad so as to cover the small pad, and is formed of the resin foam. The pad body formed to be larger than the small pad and the foamed undiluted solution composition of one of the small pad and the pad body are impregnated into the resin foam of the other, and between the small pad and the pad body. The impregnated layer is formed on the pressure receiving surface and the side surface of the small pad, and the small pad is three-dimensionally covered with the impregnated layer. The small pad is formed with a first ventilation hole formed through the small pad, and the pad body is formed with a second ventilation hole communicating with the first ventilation hole of the small pad. A front pad different from the pad body is provided on the upper front side of the pad body at a position in front of the small pad, and an air conditioner communicating with the second ventilation hole is provided between the pad body and the front pad. A space serving as an air passage is formed, and the front pad is solved by having a through hole that penetrates up and down and communicates with the air passage .

According to the above configuration, the impregnated layer is formed on the pressure receiving surface and the side surface of the small pad to form a three-dimensional structure surrounding the small pad, and has a spring property. Since the small pad is surrounded by an impregnated layer having a three-dimensional structure, it bends with respect to input from the direction perpendicular to the pressure receiving surface and the side surface (front and back, left and right, etc.) as compared with the case where there is no impregnated layer on the side surface. It becomes difficult, suppresses settling due to long-term use, and can improve sitting comfort even if it is made thinner and lighter.
Further, since the rigidity of the small pad can be increased by the impregnation layer having a three-dimensional structure, the density of the resin foam of the small pad can be suppressed and the weight can be reduced.
Further, since a cushion material can be formed by combining a small pad made of resin foams and a pad body, it is excellent in moldability and recyclability.
The pressure receiving surface of the small pad is the surface on the side where the pad body is provided, the front surface when the small pad is provided on the seat back, and the upper surface when the small pad is provided on the seat cushion. means.
Further, according to the above configuration, the small pad is formed with the first ventilation hole, and the pad body covering the small pad is formed with the second ventilation hole communicating with the first ventilation hole, so that the air permeability of the sheet is improved. As the body pressure increases, the body pressure in the lower part of the buttocks can be efficiently dispersed, so that comfort can be improved.

Further, it is preferable that the front pad has a plurality of the through holes penetrating up and down .
Further, it is preferable that the plurality of the through holes are arranged so as to be gradually separated toward the front of the seat.
Further, it is preferable that the first ventilation hole extends in the long axis direction in the front-rear direction of the seat in a plan view and penetrates in the thickness direction of the small pad.
Further, it is preferable that the first ventilation hole is formed so as to communicate with the second ventilation hole that penetrates the pad body in the thickness direction of the pad body.
Further, it is preferable that the first ventilation holes are formed in the small pad in a pair so as to be arranged in the seat width direction.

Further, a plurality of irregularities are formed on the surface of the small pad, and the plurality of irregularities are formed in a wave shape having no corners so that a plurality of peaks are continuous, and the wave shape is gradually formed toward the front side. It is preferable that the height is low .
According to the above configuration, the rigidity in the pitch direction related to the load input such as start and stop can be increased, the rigidity in the roll direction related to the load input of rolling can be increased, and the load input can be dispersed in a well-balanced manner. Since the rigidity can be further increased, the wall thickness for obtaining the predetermined rigidity can be reduced and the weight can be reduced.

Further, the vehicle seat cushion material is provided on the seat back, and the front pad is provided on the front side of the seat back facing the seated person sitting on the vehicle seat, and is provided at a position different from the small pad. It is preferable that it is arranged .

Further, when the vehicle seat includes a seat cushion, a seat back, and the vehicle seat cushion material provided on the seat cushion or the seat back, and the small pad is provided on the seat cushion. Is wider in the seat width direction than the ischium of the seated person seated on the vehicle seat, and when provided on the seat back, is arranged wider in the seat width direction than the waist portion of the seated person seated on the vehicle seat. It is preferable to have.
According to the above configuration, when the small pad is provided on the seat cushion, the lower part of the buttocks of the seated person can be stably supported by the small pad arranged wider in the seat width direction than the ischium of the seated person. Further, when the small pad is provided on the seat back, the waist portion of the seated person can be stably supported by the small pad arranged wider in the seat width direction than the waist portion of the seated person.
In particular, since the small pads are arranged wider in the seat width direction than the ischium, it is possible to balance the pressure distribution of the seat cushion, the feeling of bottoming out, and the vibration characteristics.

Further, it is preferable that the vehicle seat provided with the vehicle seat cushion material is provided on the seat cushion and the seat back, and each of the vehicle seat cushion materials is covered with a skin material .

According to the present invention, the impregnated layer has a three-dimensional structure surrounding the small pad including the pressure receiving surface and the side surface, and has a spring property. Since the small pad is surrounded by an impregnated layer having a three-dimensional structure, it bends with respect to input from the direction perpendicular to the pressure receiving surface and the side surface (front and back, left and right, etc.) as compared with the case where there is no impregnated layer on the side surface. It becomes difficult, suppresses settling due to long-term use, and can improve sitting comfort even if it is made thinner and lighter.
Further, according to the present invention, the body pressure applied to the small pad can be efficiently dispersed.
Further, according to the present invention, the rigidity of the small pad can be further increased, and the load input can be distributed in a well-balanced manner. Since the rigidity can be further increased, the wall thickness for obtaining the predetermined rigidity can be reduced and the weight can be reduced.
Further, according to the present invention, it is possible to suppress resonance to the human body and improve the sitting comfort.
Further, according to the present invention, the air permeability of the seat is enhanced and the body pressure at the lower part of the buttocks can be efficiently dispersed, so that the comfort can be improved.
Further, according to the present invention, when the seated person moves to the left and right of the seat, the small pad can be deformed to follow the seat, and the cushioning property can be maintained even when the seated person swings to the left and right. By being able to efficiently disperse the body pressure in the lower part of the buttocks, comfort can be improved.
Further, according to the present invention, the lower part of the buttocks and the lower back of the seated person can be stably supported.
Further, according to the present invention, it is possible to improve the sitting comfort without increasing the rigidity of the front side portion of the seat cushion that comes into contact with the thighs of the seated person who is seated on the vehicle seat.
Further, according to the present invention, it is possible to improve the sitting comfort without increasing the rigidity of the upper portion of the seat back that comes into contact with the waist of the seated person who is seated on the vehicle seat.

It is a perspective view of the vehicle seat which concerns on 1st Embodiment of this invention. It is explanatory drawing which shows the small pad and the front pad through the skin material of a vehicle seat. It is a schematic cross-sectional view which shows the III-III cross section of FIG. 2 about a seat cushion. It is a schematic cross-sectional view which shows the IV-IV cross section of FIG. 2 about a cushion material. It is a perspective view which shows the small pad. It is a figure which shows the relationship of the bending amount-load of the cushioning material of a single layer structure, and the cushioning material of a two-layer structure which concerns on this embodiment. It is a figure which shows the relationship of the PAD thickness-the feeling of bottoming with the cushion material of a single-layer structure and the cushion material of a two-layer structure which concerns on this embodiment when 600N is applied to a cushion material. It is a figure which shows the vibration transmission characteristic which is the relationship of the frequency-response magnification between the cushion material of a single-layer structure and the cushion material of a two-layer structure which concerns on this embodiment. It is a schematic diagram which shows the small pad which concerns on the modification. It is a schematic cross-sectional view which shows the IV-IV cross section of FIG. 2 about the cushion material which concerns on 2nd Embodiment. It is explanatory drawing which shows the small pad of the seat cushion which concerns on 3rd Embodiment. It is a schematic cross-sectional view which shows the XII-XII cross section of FIG. 11 about a seat cushion. It is explanatory drawing which shows the small pad of the seat cushion which concerns on 4th Embodiment. It is sectional drawing which shows the cushion material which concerns on other modification. It is explanatory drawing which shows the cross-sectional shape of the protrusion of the small pad which concerns on another modification. It is explanatory drawing which shows the cross-sectional shape of the protrusion of the small pad which concerns on another modification. It is explanatory drawing which shows the cross-sectional shape of the protrusion of the small pad which concerns on another modification. It is explanatory drawing which shows the cross-sectional shape of the protrusion of the small pad which concerns on another modification. It is a schematic diagram explaining the state which the cushion material is molded.

The present invention relates to a vehicle seat cushion material and a vehicle seat provided with a vehicle seat cushion material, and more particularly to a vehicle seat cushion material and a vehicle seat provided with an impregnated layer having a three-dimensional structure.
The embodiments described below are merely examples for facilitating the understanding of the present invention, and do not limit the present invention. That is, the shapes, dimensions, arrangements, and the like of the members described below can be changed and improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents thereof.

<< First Embodiment >>
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. First, the configurations of the vehicle seat S and the cushion material 2 according to the present embodiment will be described with reference to FIGS. 1 to 5.
1 is a perspective view of the vehicle seat S according to the embodiment of the present invention, and FIG. 2 is an explanatory view showing the small pad 3 and the front pad 5 through the skin material S1a of the vehicle seat S. be. Here, the small pad 3 shown in FIG. 2 is shown in a simplified manner, and the shape of the waveform formed on the surface is abbreviated.
3 is a schematic cross-sectional view showing a III-III cross section of FIG. 2 for the seat cushion S1, and FIG. 4 is a schematic cross-sectional view showing an IV-IV cross section of FIG. 2 for the cushion material 2. FIG. 5 is a perspective view showing the small pad 3.

As shown in FIG. 1, the vehicle seat S is composed of a seat cushion S1 on which a seated person sits and a seat back S2 serving as a backrest, and its surface is covered with skin materials S1a and S2a.
As shown in FIG. 2, the seat cushion S1 is composed of a cushion material 2 and a skin material S1a that covers the cushion material 2.
As shown in FIG. 1, in the seat cushion S1, a pair of hanging grooves S1b for suspending the skin material S1a are separated in the seat width direction (also referred to as the seat left-right direction) and extend in the front-rear direction. Is formed. Similarly, in the seat back S2, a pair of suspension grooves S2b for suspending the skin material S2a are formed so as to be separated in the seat width direction and extend in the vertical direction.
As shown in FIG. 4, the cushion material 2 is in the upper layer so as to cover the small pad 3 in the lower layer and the small pad 3, the pad body 1 laminated and integrated with the small pad 3, and the front side of the pad body 1. It is composed of a front pad 5 provided on the upper part and a front pad 5. The cushion material 2 is composed of a small pad 3 and a pad body 1 in a two-layer structure in a portion where the small pad 3 is located.

The small pad 3 is formed of a resin foam material such as urethane foam, polyethylene, or polypropylene. The upper surface 3b as the pressure receiving surface, which is the surface of the small pad 3 on the seated side, is uniformly formed in a waveform formed so as to have a plurality of mountains connected, in other words, in a holding container for holding a plurality of eggs. It is formed like a one-sided part.
When the small pad 3 is arranged on the seat cushion S1, it is arranged on the back side of the seat cushion S1 and at a position under the buttocks of the seated person in order to support the buttocks of the seated person. The small pad 3 is formed to have a width larger in the seat width direction than the ischium of the seated person, and is formed up to the vicinity of the pair of suspension grooves S1b.

Further, when the small pad 3 is arranged on the seat back S2, it is arranged at a position corresponding to the rear of the seated person's waist part so as to support the seated person's waist part. In particular, the small pad 3 is formed to have a width larger in the seat width direction than the waist of the seated person, and is formed up to the vicinity of the pair of hanging grooves S2b provided in the seat back S2.
The pressure receiving surface of the small pad 3 is arranged so as to be substantially equal to the surface of the seat cushion S1 or the seat back S2 to be arranged. By arranging the small pads 3 in this way, the body pressure from the seated person can be efficiently dispersed. Here, the pressure receiving surface of the small pad 3 is the upper surface 3b of the small pad 3 arranged on the seat cushion S1 and the front surface of the small pad 3 arranged on the seat back S2.
Further, since the small pad 3 can be formed into a three-dimensional shape by using a molded product, there is a degree of freedom in design, and the cost can be reduced as compared with the one in which the urethane slab is profiled.

The pad body 1 is formed of molded urethane and is formed before and after the seat cushion S1 to form the contour of the seat cushion S1.
Further, the density of the pad body 1 is formed to be smaller than the density of the small pad 3, and the thickness of the pad body 1 is formed to be thicker than the thickness of the small pad 3. By being formed in this way, it is possible to absorb the vibration applied to the pad body 1, suppress the resonance to the human body, and improve the sitting comfort.

As shown in FIG. 4, the impregnated layer 3a is formed so as to thinly cover the upper surface 3b and the side surface 3c of the small pad 3 in contact with the pad body 1.
The impregnating layer 3a is formed so as to cover the upper surface 3b and the side surface 3c of the small pad 3. By forming the impregnated layer 3a three-dimensionally in this way, it is possible to increase the rigidity against a load in the vertical direction. For this reason, the small pad 3 is less likely to bend, settling due to long-term use can be suppressed, and even if the thickness and weight are reduced, the sitting comfort can be improved.

The front pad 5 is made of a resin foam material such as urethane foam, polyethylene, or polypropylene, and has a plurality of through holes 5a arranged so as to penetrate vertically and gradually separate toward the front.
Then, as shown in FIG. 3, a space serving as an air-conditioning air passage 1a is formed between the pad main body 1 and the front pad 5. In this way, the air-conditioning air passage 1a or the heater 6 can be provided in a space that becomes wider by the amount that the cushion material 2 is made thinner. In this way, a device or the like that forms a comfortable environment can be mounted in a limited space.

Although it has been described that the air passage 1a is formed between the pad main body 1 and the front pad 5, similarly, a part between the pad main body 1 and the small pad 3 and the small pad 3 are described. An air passage may be provided on a part of the lower surface. In this way, by providing an air passage around the small pad 3, the body pressure applied from the buttocks can be dispersed to improve the riding comfort, and the air permeability under the buttocks can be improved to improve the comfort. can.

(About the performance of the cushion material)
Normally, when the thickness of the cushion material 2 is reduced, the amount of bending with respect to the applied load becomes large, which may give the seated person a feeling of bottoming out. Furthermore, if the single-layer structure is changed to a laminated structure, the natural vibration may fluctuate and the resonance frequency and the resonance magnification may change, which may cause unpleasant vibration due to resonance with the vibration of the vehicle.

Therefore, the performance of the cushion material 2 having a thickness of 80 mm according to the above configuration will be described with reference to FIGS. 6 to 8 in comparison with the performance of the cushion material 2 having a thickness of 100 mm according to the conventional single-layer structure.
Note that FIG. 6 is a diagram showing the relationship between the amount of deflection and the load between the cushion material having a single-layer structure and the cushion material 2 having a two-layer structure according to the present embodiment. Further, FIG. 7 is a diagram showing the relationship between the PAD thickness and the bottomed feeling between the cushion material having a single-layer structure and the cushion material 2 having a two-layer structure according to the present embodiment when 600 N is applied to the cushion material. Further, FIG. 8 is a diagram showing a vibration transmission characteristic which is a frequency-response magnification relationship between the cushion material having a single-layer structure and the cushion material 2 having a two-layer structure according to the present embodiment.

The data A in FIGS. 6 to 8 is data for the cushion material having a single-layer structure, and the data C is data for the cushion material 2 having a two-layer structure. The filled portion of FIGS. 6 to 8 shows a range permitted because the cushion material 2 has the same or higher performance than the cushion material having a single-layer structure.

As shown in FIG. 6, the data C has substantially the same amount of deflection as compared with the data A, even though the thickness of the cushion material 2 is reduced. That is, the cushion material 2 was able to maintain the cushioning property even though the thickness was reduced.

Further, as shown in FIG. 7, the data C was able to reduce the feeling of bottoming out as compared with the data A. Here, the bottoming feeling is the static spring constant when the load shown in FIG. 6 is 600N. When this value is small, the fluctuation of the reaction force from the cushion material is small, and the sitting comfort is improved.

Further, as shown in FIG. 8, in the data C, the resonance frequency in the resonance state where the response magnification peaks can be made substantially the same as that in the data A, and the resonance magnification can be lowered.
In particular, the frequency at which the seated person feels uncomfortable is 6 Hz, which is close to the natural frequency of the abdomen. According to the cushion material 2, since the frequency lower than 6 Hz is the resonance frequency, it is possible to avoid giving discomfort to the seated person. The natural frequency of the cushion material 2 can be adjusted by changing the thickness and the forming position of the impregnated layer 3a.

Further, regarding the body pressure distribution, when the thickness of the cushion material 2 is reduced, a high pressure locally appears remarkably.
However, the cushion material 2 having a two-layer structure and a thickness of 80 mm has a density equivalent to that of the cushion material having a single-layer structure and a thickness of 100 mm by making the density of the pad body 1 on the upper layer smaller than that of the single-layer structure. It is possible to maintain a stable body pressure distribution.

As described above, according to the vehicle seat S and the cushion material 2 according to the above embodiment, while reducing the thickness of the cushion material 2, the vibration received by the vehicle is absorbed, the resonance to the human body is suppressed, and the person sits down. You can feel good.

<Modification example>
In the above embodiment, the small pad 3 having a uniform surface shape of the waveform has been described, but the present invention is not limited to such an embodiment.
For example, as shown in FIG. 9, a small pad 13 having a non-uniform surface shape having wave shapes 13a and 13b having different heights h may be used.
In particular, the small pad 13 according to this modification is arranged on the seat cushion S1 so that the wave shape 13a having a low height h is located on the front side of the seat cushion S1 to which repeated stress from the thigh of the seated person is likely to be applied. It is set up. The wave shapes 13a and 13b are gradually deformed in which the height gradually decreases toward the front side.

By arranging the small pads 13 in this way, the rigidity of the front side of the seat of the small pads 13 can be lowered, and the reaction force received from the small pads 13 on the thighs of the seated person can be reduced, thereby improving the sitting comfort. Can be good.
When the small pad 13 is provided on the seat back S2, it may be arranged on the seat back S2 so that the wave shape 13a having a low height h is located above the seat back S2.
By doing so, it is possible to suppress an increase in the rigidity of the seat back S2 that abuts on the upper part of the waist of the seated person where the wave shape 13a is located, and to improve the sitting comfort.

Further, for the same reason, the small pad 13 that reduces the reaction force, such as the front side portion where the seated person's thigh is located in the seat cushion S1 and the upper portion where the upper part of the seated person's waist is located in the seat back S2. It is not necessary to form the impregnated layer 3a on a part of the side surface of the above as described later. In other words, since the impregnated layer 3a is formed on the small pad 13 other than these portions, it is possible to improve the sitting comfort while increasing the rigidity.

<< Second Embodiment >>
In the above embodiment, only the surface of the small pad 3 on the seated side is described as having a corrugated shape, but the present invention is not limited to such a configuration.
The small pad 23 according to the second embodiment will be described below with reference to FIG. Note that FIG. 10 is a schematic cross-sectional view showing an IV-IV cross section of FIG. 2 for the cushion material 22 according to the second embodiment.

The cushion material 22 is composed of a small pad 23, an impregnation layer 23a, and a pad body 1. Of these, the small pad 23 is formed in a corrugated manner not only on the upper surface 23b as the pressure receiving surface but also on the side surface 23c, unlike the small pad 3 according to the first embodiment. Along with this, the impregnated layer 23a covering the outer surface of the small pad 23 is formed in a corrugated manner up to the side surface, unlike the impregnated layer 3a according to the first embodiment.

According to the cushion material 22 having the small pad 23 formed in this way, the small pad 23 and the impregnated layer 23a project substantially in the horizontal direction, so that the cushion material 22 has rigidity against moments in the roll direction and the pitch direction. Can be enhanced. In other words, it is possible to increase the rigidity of the small pad 23 against swinging around an axis in a direction extending on a substantially horizontal plane.
In particular, the cushion material 22 having high rigidity is suitable because it can improve the sitting comfort when used for a retractable seat in which the support rigidity in the rear seat of the vehicle is low and vibrations in the front-rear and left-right directions are likely to occur.

The present invention is not limited to the form in which the side surface 23c of the small pad 23 is corrugated, and the rigidity is adjusted by changing the volumes of the small pad 23 and the impregnated layer 23a, for example, by forming the small pad 23 in a tapered shape. You may do it.

<< Third Embodiment >>
Next, the seat cushion S11 according to the third embodiment having good air permeability will be described with reference to FIGS. 11 and 12. 11 is an explanatory view showing the small pad 33 of the seat cushion S11 according to the third embodiment, and FIG. 12 is a schematic cross-sectional view showing the XII-XII cross section of FIG. 11 for the seat cushion S11.

The seat cushion S11 according to the third embodiment includes a pad main body 31 and a small pad 33.
As shown in FIGS. 11 and 12, the small pad 33 is formed with a pair of first ventilation holes 33a provided side by side in the seat width direction. The first ventilation hole 33a extends in the long axis direction in the front-rear direction of the seat in a plan view, and is formed so as to penetrate in the thickness direction of the small pad 33.

As shown in FIG. 12, the pad main body 31 is formed with a second ventilation hole 31x including a vertical hole portion 31a, a horizontal hole portion 31b extending substantially vertically from the vertical hole portion 31a, and a horizontal hole portion 31b.
The vertical hole portion 31a is formed so as to communicate with the extension of the first ventilation hole 33a of the small pad 33 and penetrate the pad main body 31 in the thickness direction which is the vertical direction.
The horizontal hole portion 31b is formed so as to be continuous from the lower portion of the vertical hole portion 31a, and when a plurality of through holes 5a are formed so as to be gradually separated toward the front in a plan view, the seat front-rear direction is used as a reference. It is formed so as to extend diagonally forward. The horizontal hole portion 31b is connected to the air passage 1a at a point extending forward.

By forming the vertical hole portion 31a in the pad body 31 in this way, the body pressure of the seated person can be dispersed radially around the vertical hole portion 31a, and the riding comfort can be improved. ..
Further, the small pad 33 is formed with the first ventilation hole 33a, and the pad body 31 is formed with the second ventilation hole 31x, so that the ventilation of the seat cushion S11 is improved.

In particular, it is preferable that the first ventilation hole 33a and the vertical hole portion 31a are arranged within the maximum load region of the buttocks of the seated person. With this configuration, when the seated person swings up and down while the vehicle is running, the volume of the vertical hole portion 31a is reduced and restored, so that the air in the vertical hole portion 31a becomes the first ventilation hole 33a. The cushion material 2 is suitably ventilated in the thickness direction of the cushion material 2.

Then, in the pad main body 31, the horizontal hole portion 31b is continuously formed in the vertical hole portion 31a, and further, the horizontal hole portion 31b is connected to the air passage 1a, so that the air can blow the horizontal hole portion 31b during the above-mentioned vehicle traveling. It goes back and forth between the vertical hole portion 31a and the air passage 1a. At this time, air also flows from the air passage 1a to the through hole 5a. Therefore, air flows from below to the thighs of the seated person located above the through hole 5a, and the comfort of the seated person is improved.
In addition to when the vehicle is running, for example, by providing a blower (not shown) on the vehicle seat S, air is forcibly flowed through the air passage 1a, the second ventilation hole 31x, the first ventilation hole 33a, and the like. It can also increase breathability.

<< Fourth Embodiment >>
Next, the seat cushion S21 according to the fourth embodiment, which can maintain the cushioning property even when the seated person moves in the left-right direction of the seat, will be described with reference to FIG. Note that FIG. 13 is an explanatory diagram showing a small pad 43 of the seat cushion S21 according to the fourth embodiment.

The seat cushion S21 according to the fourth embodiment includes a small pad 43.
As shown in FIG. 13, the small pad 43 is formed with a slit 43a notched in the thickness direction from the front surface to the rear in the center in the seat width direction. That is, the front side of the small pad 43 is divided in the seat width direction by the slit 43a as the dividing portion, so that the small pad 43 can be slightly moved in the seat width direction.
On the other hand, on the rear side of the small pad 43, since the slit 43a is not formed up to the rear surface of the small pad 43, the movement in the seat width direction is restricted, so that the entire shape of the small pad 43 is maintained. It becomes.

By forming the slit 43a in the small pad 43 in this way, for example, even when the seated person's posture is tilted in the seat width direction when the vehicle is traveling on a curve or when the seated person gets on and off the vehicle, the small pad 43 is formed. The front side of 43 will follow.
Therefore, even when the body pressure is unevenly applied to the seat cushion S21, the body pressure of the seated person can be suitably dispersed, and the cushioning property can be maintained and the comfort can be enhanced.

In the present embodiment, an example of a small pad 43 having a slit 43a notched in the thickness direction from the front surface to the rear surface has been described, but the present invention is not limited to such a configuration. For example, the small pads may be two or more formed completely separated in the seat width direction.

In the above embodiment, when the cushion materials 2 and 22 are provided on the seat cushion S1 and the seat back S2, the cushion materials 2 and 22 are arranged so that the corrugated surface is located on the seater side (pressure receiving surface side). Although described as being provided, the present invention is not limited to such a configuration.

For example, the cushioning materials 2 and 22 may be arranged so that the corrugated surface is located on the opposite side of the seated side, that is, on the back surface side. By doing so, the load received from the seated person can be dispersed on the back surface side, and the sitting comfort can be improved.
In addition, both the front surface side and the back surface side, which are the seated side, may be formed in a waveform. In this way, the cushion materials 2 and 22 can be reduced in weight.
In particular, the configurations of the cushion materials 2 and 22 having a corrugated shape on the back surface side are suitable when applied to the seat cushion S1 mounted on the floor frame having high rigidity.

Further, in the above embodiment, the wave shape formed on the small pads 3 and 23 has no corners and is easy to disperse stress, and is less likely to cause poor formability such as lack of meat, resulting in high mass productivity. It is suitable because it is expensive.
However, if the rigidity of the cushion materials 2 and 22 can be increased and there is no problem of moldability such as lack of meat, the shape is not limited to such a shape, and any shape having irregularities may be used.

<Other variants>
Here, an example of the small pad 53 having various various protrusions 53b, 63a, 63b, 63c, 63d will be described with reference to FIGS. 14, 15A, 15B, 15C, and 15D. 14 is a cross-sectional view showing the cushion material 52 according to another modified example, and FIGS. 15A to 15D show the cross-sectional shapes of the protrusions 63a, 63b, 63c, 63d of the small pad 53 according to the other modified example. It is explanatory drawing.

As shown in FIG. 14, the cushion material 52 according to another modification is composed of a small pad 53, a pad main body 51 that covers the small pad 53 from above, and an impregnated layer 53a formed between them. ing.
In particular, the small pad 53 has a plurality of protrusions 53b protruding upward, unlike the above embodiment having a continuously formed corrugated upper surface 3b. As the cross-sectional shape of the protrusion 53b, the hexagonal cross-sectional shape shown in FIG. 15A is particularly preferable because the body pressure applied from the seated person can be suitably dispersed to each side of the hexagon.
On the other hand, the cross-sectional shape of the protrusion 53b is not limited to such a shape, such as a circular cross-sectional shape shown in FIG. 15B, an elliptical shape shown in FIG. It may have a polygonal cross section. Here, it is referred to as a cross-sectional polygonal shape including a hexagonal cross-section, a quadrangular cross-section, a triangular cross-section, and other graphic shapes in which the cross-section is composed of a plurality of corners. As described above, it is preferable that the protrusion 53b is formed in a circular cross-section, an elliptical cross-section, or a polygonal cross-section because it is easy to disperse the body pressure applied from the seated person.

As described above, the protrusions 53b, 63a, 63b, 63c, 63d are not limited to those formed on the surface side (in other words, the pressure receiving surface side) of the small pad 53, but are formed on the side surface side. May be. When the protrusions 53b, 63a, 63b, 63c, 63d are formed not only on the front surface side but also on the side surface side, the contact area between the small pad 53 and the pad body 51 becomes wide, so that the bonding strength increases. ..

(About molding method)
As an example of the molding method of the cushion material 2, there is a method of inserting the small pad 3 into a mold and then insert molding the pad body 1.
In particular, as a method for forming the impregnated layer 3a except for one surface of the side surface 3c of the small pad 3, the lower mold M1 and the upper mold M2 shown in FIG. 16 are used.
Note that FIG. 16 is a schematic diagram illustrating a state in which the cushion material 2 is being molded.

Specifically, a lower mold M1 formed in a box shape having a U-shaped cross section and a stepped upper mold M2 formed so as to close an opening above the lower mold M1 are provided in a small pad in the space SP between them. 3 and the pad raw material 1b as the foaming stock solution composition which is the raw material of the pad main body 1 are combined in a state of being arranged. Then, the temperature in the space SP is raised or the pressure is lowered to expand the pad raw material 1b until the space SP is filled.
In this way, the pad body 1 integrally formed with the small pad 3 is formed. The high-rigidity impregnated layer 3a is naturally formed by impregnating the small pad 3 with the pad body 1 and performing insert molding.

In particular, when the impregnated layer 3a is not formed on one surface of the side surface of the small pad 3, an upper mold M2 having a wall M2a protruding toward the space SP side is prepared, and the impregnated layer 3a of the small pad 3 is prepared on this wall M2a. The small pad 3 is arranged in the space SP so that the surfaces that do not form the surface are in contact with each other. Then, similarly, the pad raw material 1b is expanded until the space SP is filled. In this way, the pad body 1 integrally formed with the small pad 3 is formed.
By doing so, since the pad raw material 1b cannot enter the portion of the small pad 3 that comes into contact with the wall M2a and does not come into contact with the small pad 3, it is possible to avoid forming the impregnated layer 3a. ..

1 Pad body 1a Blower 1b Pad raw material (foaming stock solution composition)
2 Cushion material (vehicle seat cushion material)
2a Through hole 3 Small pad (lower layer)
3a impregnated layer 3b upper surface (pressure receiving surface, surface)
3c Side 5 Front pad 5a Through hole 6 Heater 13 Small pad 13a, 13b Wave shape 22 Cushion material (Vehicle seat cushion material)
23 Small pad 23a Impregnation layer 23b Top surface (pressure receiving surface, surface)
23c side surface (surface)
31 Pad body 31a Vertical hole 31b Horizontal hole 31x 2nd ventilation hole 33 Small pad 33a 1st ventilation hole 43 Small pad 43a Slit (partition)
51 Pad body 52 Cushion material (Vehicle seat cushion material)
53 Small pad 53a Impregnation layer 53b Protrusions 63a, 63b, 63c, 63d Protrusions M1 Lower mold M2 Upper mold
M2a Wall S Vehicle seat S1, S11, S21 Seat cushion S1a Skin material S1b Hanging groove S2 Seat back S2a Skin material S2b Hanging groove SP Space h Height t Thickness w Width

Claims (10)

With a small pad formed of resin foam,
A pad body that is laminated and integrated on the pressure receiving surface side of the small pad so as to cover the small pad, is formed of a resin foam, and is formed larger than the small pad.
The small pad and the foamed stock solution composition of one of the pad bodies are impregnated into the other resin foam, and the small pad and the pad body are provided with an impregnated layer formed in at least a part thereof.
The impregnated layer is formed on the pressure receiving surface and the side surface of the small pad.
The small pad is three-dimensionally covered with the impregnated layer.
The small pad is formed with a first ventilation hole formed through the small pad.
The pad body is formed with a second ventilation hole that communicates with the first ventilation hole of the small pad.
A front pad different from the pad body is provided on the front upper portion of the pad body at a position in front of the small pad.
A space serving as an air-conditioning air passage communicating with the second ventilation hole is formed between the pad body and the front pad.
The front pad is a vehicle seat cushion material having a through hole that penetrates up and down and communicates with the air passage . The vehicle seat cushion material according to claim 1, wherein the front pad has a plurality of the through holes penetrating vertically. The vehicle seat cushion material according to claim 2, wherein the plurality of through holes are arranged so as to be gradually separated toward the front of the seat. One of claims 1 to 3, wherein the first ventilation hole extends in the long axis direction in the front-rear direction of the seat in a plan view and penetrates in the thickness direction of the small pad. The vehicle seat cushion material described in item 1. The first ventilation hole is formed in any one of claims 1 to 4, wherein the first ventilation hole is formed so as to communicate with the second ventilation hole that penetrates the pad body in the thickness direction of the pad body. The vehicle seat cushion material described. The vehicle seat cushion material according to any one of claims 1 to 5, wherein the first ventilation holes are formed in a pair of the small pads so as to be arranged in the seat width direction. A plurality of irregularities are formed on the surface of the small pad.
The plurality of irregularities are formed in a wave shape without corners so that a plurality of peaks are continuous.
The vehicle seat cushion material according to any one of claims 1 to 6, wherein the wave shape gradually decreases in height toward the front side. The vehicle seat cushion material is provided on the seat back and is provided on the seat back.
17. The vehicle seat cushion material described in any of the above. Seat cushions and seat backs,
A vehicle seat comprising the vehicle seat cushion material according to claim 1 provided on the seat cushion or the seat back.
When the small pad is provided on the seat cushion, it is wider in the seat width direction than the ischium of the seated person who sits on the vehicle seat, and when it is provided on the seat back, the seat is seated on the vehicle seat. A vehicle seat characterized in that it is arranged wider in the seat width direction than the waist of the person. A vehicle seat provided with the vehicle seat cushion material according to claim 1.
The vehicle seat cushion material is provided on the seat cushion and the seat back, and is covered with a skin material, respectively.

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